How do you know how much PAG oil to add?

To determine the accurate amount you'll need to put in, drain out the oil from your old compressor then measure it. You should then drain the replacement compressor and put back in the exact equal amount that had come out of your old compressor.

How much PAG oil do I put in a new compressor?

Lets add oil back to the new compressor in an amount equal to the amount drained from the old compressor. 3 oz. Old Compressor 2 oz. Old Dryer 5 oz needed in new compressor Typically you'll want to change the receiver dryer along with the compressor.

What happens if you add too much PAG oil?

If you add too much oil to the system, it may pool in various places of the system and can coat the inner walls of the evaporator and condenser coils. This will diminish their ability to absorb or dissipate heat, thereby bringing down the overall cooling performance.

Should I add PAG oil after vacuum?

Absolutely not. You don't need to add any oil and there will be some oil in the refrigerant when you charge the system. Pull a good vacuum with a Micron gauge to 500 microns. This will ensure all the moisture is out of the system.

How do you know if your AC compressor is low on oil?

If the problem is due to an oil loss, you may see the following telltale signs inside the compressor: All rods and bearings will be worn or scored. The crankshaft will be uniformly scored. Rods may be broken due to the compressor seizing up.

How To Add PAG Oil Into An AC System



How do you know if you have too much oil in your AC system?

Inefficient Cooling

The most glaring sign of an overfilled AC system is poor cooling because an internal coating forms resulting in reduced heat transfer. For instance, you might notice that it's taking way too long to cool things or your windows stop defogging properly.

How do you know if your car has too much oil?

There are other indicators that will suggest you have an overfill problem, including blue exhaust smoke, a burning smell, an oil leak, or a high reading on your oil pressure gauge (if equipped).

What does an overcharged car AC sound like?

Compressor Noises

Normally, a vehicle's AC makes sounds because of the air coming out of the vents. However, one tell-tale sign of overcharging the car's cooling unit is when it makes an unknown sound. In particular, the AC makes a weird buzzing or humming sound while it's functioning.

How much PAG oil do I put on after recovery?

You stated in your question that it requires 135ml, so remove any oil still in the system then add that amount.

How much AC oil do I need?

The total system oil capacity for many late model passenger car A/C systems is only about 4 ounces (120 ml). A low oil level can starve the compressor for oil and lead to compressor failure. CAUTION: Do NOT overfill the the A/C system with too much compressor oil.

How long do you pull a vacuum on a car ac?

When concerned as to how long to vacuum ac system, you should know that it would take around 30-45 minutes. This is enough time period to get rid of moisture and dust inside the AC system.

How much oil goes in a car AC compressor?

The total system oil capacity for many late model passenger car A/C systems is only about 4 ounces (120 ml). A low oil level can starve the compressor for oil and lead to compressor failure. CAUTION: Do NOT overfill the the A/C system with too much compressor oil. Too much oil can hurt cooling performance.

Do I need to add PAG oil when replacing condenser?

When replacing a part like the condenser it is a good idea to add some extra oil with the new refrigerant. Most refrigerants do have some oil in them which should be enough. The majority of the oil in the system stays in the compressor so you should not have any issues if you do not add any more.

Is it okay to overfill oil a little?

Overfilling also increases oil pressure, putting more stress on seals and gaskets that keep oil from leaking out of the engine or going places it shouldn't on the inside. Over time, the added stress accelerates wear on those seals and gaskets.

What happens if you overfill oil by 1 quart?

You most likely will not cause damage by running only an extra quart. Many people racing with stock oil pans will run half a quart to a quart of extra oil to prevent the oil pump pickup from drawing in air under racing conditions.

What does too much oil look like on a dipstick?

The simplest way to tell if there's too much oil in the engine is to check the dipstick. In most vehicles, the dipstick will have low and high marks that indicate the oil level. If the excess oil is just 1-2 millimeters above the fill line, this shouldn't be cause for concern.

What are the causes of too little oil in a compressor?

Loss of oil can be easily caused by:
  • The Compressor short cycling on its control stat.
  • Oil traps in the pipe work (incorrect system design)
  • Loss of gas charge.
  • Pipe work design (incorrect pipe work velocity, risers etc.)
  • Too much oil in transit around the system.
  • Insufficient oil charge in the system (long pipe runs)


What does it mean when there is no oil on the dipstick?

There is no oil on the dipstick when cold because your engine had consumed much more oil than it should have between the last time you changed the oil and when you checked the dipstick. This is a serious issue and often indicates more problematic engine issues, like faulty engine parts, for example.

Can low oil cause AC to stop working?

Inadequate oil lubricant. To take the heart comparison a step further, think of your air conditioner's oil lubricant like the blood in your body. If there's not enough, the system can't work properly and all kinds of problems can result, including AC compressor failure.

What color is AC compressor oil?

Refrigerant or PAG (synthetic compressor) oil is clear, he explains. Over time, it picks up moisture and turns acidic, eating away at the condenser, thermal expansion valve, evaporator, fittings, compressor and other metal components. Gradually, the oil turns yellow and darkens as it picks up particles and sludge.

Do you add AC oil to high or low-side?

You can use an oil injector on the low-side port while the car is running, fully-charged. That's the "suction" side of the system. Assuming you only changed a seal or hose, you don't need more than a 1/4oz (or whatever you pulled out).